Windshield wiper



Dec. 1'8, 1928.

D. KUSKIN WINDSHIELD WIPER Filed Jul-y l, 1927 INVENTOR DAW/o Kus/mv fr f Il Irl.

QN WN /lwmra ATTORNEYS Patented Dec. 18;

UNITED )STATES y 1,696,044 .PATENT OFFICE.-

PAVID KUSKINZOF vYORK, N..Y., ASSIGNOB TO FULL VIEW 'WINDSHIELD WIPEIL' INC., A CORPORATION.

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` Application med July 1,

The present invention is concerned with the provlslon of improvements 1n automatic window cleaners which may have a wide range lof utility. The invention finds its preferred embodiment, however, in a wind-- shieldl wiper `for automobiles and is f the character in which suction or low pressures created in the engine supply the motive power for actuating the wiper.

An object of the invention is to provide a device of this 'character so constructed that there will be no problem of air leakage which might destroy the differential pressures essential to successful operation of the power pistons.

Obviously, a single pistonl can not be reciprocated by differential pressures in a closed tube, since some means must be provided for connecting the piston and the wiper which it actuate's.- The use of such connecting vmeans'passing through the walls of the tube a suction line andthe atmosphere, such' means .being valve lcontrolled 'through trip mechanism operated-by the wiper.

Other and more general objects of thenvention are' to provide a windshield wiper of comparatively simple constructiomrhav'- ing a minimumnumber of operating parts likely to t out of'. order, and a windshield wiper whlch may be conveniently' installed and. economically operated.

' `lVith the above noted and bther objects in4 view, the invention consists in certain novel through La windshield wiper embodying 'the present invent-ion.

,the claims.

fea-tures of construction and combinations and arrangements of parts', as will be more fully hereinafter set forth and pOinted out in The invention vmay be. more fully understood from .the following description in connection with the accompanying drawings, whereinp Fig. 1. isl ak longitudinal sectional view y Fig. 2 is an enlarged transverse sectional view on the line 2--2 of Fig. 1.'

'11527. `serial no. 202373.

3. is an enlarged ,sectional detaill through the valve and its associate mechanism showing the position of theparts when Vthe lower cylinder is in communication with the suction line. 1

Fig. 4 is a reduced perspective view of the valve trip member. I

In the drawings I have used the reference numeral 10 to indicate `a unitary body or`casing formed with an upper cylinder 11 and lowerA cylinder 12 extending' longitudinally thereof. The two integrally connected cylinders are parallel and each include a closed' end and an open end. The open end 0f one cylinder 'is arranged adj acentu theA closed end of theV other. The two ends of the body 10 are received in hollow casings 13 and 14 respectively, these casings being formed with projecting plate portions 15 adapted ,to be secured in any appropriate manner to an automobile just above the windshield.v

Parallel to the cylinders 11 and 12 and disposed between them isa longitudin-all eX-' tending passagewa 16 in the body, sai passageway having'a ongitudinal slot -17 in one wall thereof in which an arm 18'works. The outer end of the arm 18 is rigidly connected with the shank 19 of a windshield wiper- (not shown) and the inner end of the arm 18 is connected by the intermediate portionV to ablock 43 on a flexible device 20 arranged within the passageway 16.

. One end of the flexible device '20 isV passed aroundA a pulley 21,11oused in the casing 13 and anchored to a power pliston 22 sliding in the upper cylinder 11. T e other end of the flexible device 20 is passed around a pulley 23 arranged in the casing 14 and `through the open end'of the lower cylinder 12 where 'it is anchored to la corresponding piston 24 working in the lower cylinder.

It will be seen that as the power pistons are arm 1 8 which is attached to the iexible device 2O will-be reciprocatedin the slo't 17 and the windshield wiper will be drag ed back and forth across the face of the win shield. If the tubes are of the` proper length the travel ofthew'iper may embrace the entire width of the windshield.` Y

Means is provided for alternatel ting air through the closed ends of zh ders and placing the closed ends of he cylinders in communication with a lo-w pressure line.` With this in view, a valve casing 25 alternately reciprocated in their cylinders thc is arranged within the casing 13. This valve neasing has port 26 therein communicating with the outer end and a suction port 27 communciating with a suction line 28 which may run to any suitable source of suction, such for instance as the engine exhaust manifold. A pipe 29 entering the casing 25. communicates with the closed end ofthe cylinder 11 through a restricted passageway 30. A corresponding pipe 31 connects the closed end of the cylinder 12 with the valve casing 25.

Any suitable type of valve, such for instance as the rotary plug valve 32 is mounted in the valve casing 25 and provided withy a pair-of generally arcuate passages 33 and 34. An operating lever 35 is provided for shifting the valve from one extreme position to the other. Whenever the closed end of one cylinder is admitting air the other cylinder will be communicating with the suction line.

Means is provided for automatically shifting the valve operating lever 35 at the completion of each stroke of the Wiper. 'Such means may include a trip member in the nature of an elongated flat plate 40 mounted for sliding movement in the grooves 41 of the passageway 16. Integrally with the plate 40 at one end is an ear`42 straddling the flexible device 20 and disposed inthe path of movement of a block 43 which carries the arm 18. Near its other end the plate 40-is provided with an offset portion 44 apertured for the reception of flexible device. Beyond the oil'- set an extension 45 of the member 40 is connected to the valve operating lever35 by link 46.

As best seenin Fig. 1 the block 43 upon movement to the right en ges the ear 42 sliding the plate 40 to the right and shifting the valve 32 to the position illustrated in Fig. 1. Movement of the block 43 to the left causes an enlargement 50 on the flexible device to enga e the offset 44 of the trip member and shi the trip member bodily to the left reversing the position of the valve 32. Thisgpositien of the valve is illustrated in The operation of the device is essentially as follows:

' With the parts in the position of Fig. 1, piston 22 will move to the right due to the differential pressures existing 1n the cylinder 11. Inasmuch as pipe 31 at this time communicates freely with the outer air, piston 24 will not oppose such movement and the piston-22 needs only to overcome the friction'al drag ofthe Wiper across the Windshield and the friction of the pistons in the tubes.

As the piston 22 nears the closed end of its cylinder 11 member 50 will actuate the trip 40 and shift the valvel 32 to the position of Fig. 3. At this time the closed end of the cylinder 12 communicates with the suction line 28 and pressures areequalized on oppo-w site sides o the piston 22. Piston 24 will therefore be drawn to the left until such time shifts the valve. The cycle of the operation above described then again takes place.

To uard against possible damage or wear cause by either piston striking the closed end of its cylinder, cushioning springs such as 55 may be employed.

Obviously, various changes andalterations might be made in the general form and arrangement o t'v parts described Without departing from the invention. Hence I do not Wish to limit myself to the details setfortli, but shall consider myself at liberty to make such changes and alterations as fairly fall Within the spirit and scope of the appended claims.

I claim: 1. An operating mechanism for reciprocating Windshield Wipers including a pair of parallel cylinders each open at one end and closed at the other, the open end of each cylinderbeing arranged adjacent the closed'end of the other, valve means for` alternately admitting and exhausting-airthrough the closed ends of the eylin ders, la piston in each cylinder and a flexible device connecting-the pistons.

2. An operating mechanism for reciprocating Windshield'wipers including a pair of .parallel cylinders each open at one end and .closed at the other, the open end of each cylinder being arranged adjacent the closed end inder being arranged adjacent the closed end of the other, valve means for alternately admitting and exhausting air through the closed ends ofthe cylinders, a piston in each cylinder and a flexible device connecting the pistons, means actuated by the flexible device for shifting the valve means.

4. A deviceas set forth in claim 1 wherein the cylinders are formed in a common block and said block provides a central passageway between the cylindersthrough which the flex-l ible device passes.

5. An operating mechanism for reciprocating windshield Wipers including a pair of cylinders each open at one end and closed at the other, valve means for alternately admitting and exhausting air through the closed ends of the cylinders, a piston in each cylinder, and a flexible device connecting the pistons through the open ends of the cylinders, said llex1ble device adapted to be operatively connected to a windshield wiper.

DAVID KUSKIN. 

